Hack-saw frame



Feb. 9 1926.

F. A. STIERHEIM HACK sAw FRAME Filed Jan. 25. 1924 .2A Sheets-Sheet 1 INV EN TOR Ls'w, B" 1MM# WI TN ESSES A TTORNE YS Feb. 9 1926. 1,572,823

F. A. STIERHEIM HACK sAw FRAME Filed Jan. 23, 1924 2 Sheets-Sheet 2- ATTORNE YS Patented Feb. 9, 1926.

UNI-TED "STA-TES 1,57a`a23 PATENT. orties.

FRANCIS ALEXANDER STIERI-IEM, OF LPITTSBURGH, PENNSYLVANIA.

HACK-saw runnin.

Application filed January 23,1924. Serial No. 687,9E3.

To all whom t may concern: n

Be it known that l, FRANCIS ALnxANDnn S'rinnriiniin a citizen of theUnited States, and a Vresidentof Pittsburgh, in the countyof Alleghenyand State of Pennsylvania,

have `ini'fented certain new and useful Inipiovements in Hack-SawFrames, of which the following is a specication.

This invention relatesl to an improvement in hack saw frames, and hasfor its object to provide a simple and compact structure of thischaracter which is extensible and adjustable so lasl to be equally vwelladapted to be advantageously used upon worl; of large or smalldimensions.

i further object is to provide a hack saw frame having the foregoingenumerated adwherein provision is made for the utilization of brokenblades.

Other objects and advantages of the invention reside in certain' novelfeatures of the construction, combination and arrangement of parts whichwill be hereinafter more fully described and particularly pointed out inthe appended claims, reference being had to the accompanying drawingsforming part et' this specification, and in which: Y y

Figure 1 is a fragmentary view in side eleration, showing one embodimentof the invention;

Figure 2 is a top plan lView of the device shown in Figure 1;

Figure 3 is a view thereof, partly in vertical section and partly inelevation;

Figures 4 and 5 are views in section on lines 4 4 and 55 respectively ofFigure 1;

Figure 6 is a fragmentary view in side eleration of another form of theinvention;

Figure 7 is a fragmentary perspective View, showing the handle employedin Figure 6; and

Figure 8 is a view in section on line 8-8 of Figure 6.

Referring to the drawings and more especially to Figures 1 to 5inclusive, the numeral 1 designates the body portion or bridge bar ofthe hacksaw frame which Comprises an elongated solid bar of metal ofrectangular cross section and having smooth exterior faces.

ly appear. "niember 3 of tubular forni and having curved attaching wings4' fixed to an end of the At one end of the body portion 1, a iiXed *leg2 is arranged, the leg 2 being liXed with vvrespect to the longitudinalaxis of the body portion but being extensible as will present- Tlie leo'.2 consists of a lined body portion 1. An adjustable member a isslidably fitted in the tubular member 3 and is releasably secured inadjusted position with respect to the tubular member. Ato-.ne end of theadjustable member an adjustable sau/"holder G of Conventionalconstruction is releasably secured.

lli`r slide 7 is fitted for longitudinal adjust- Vnienton the end of thebody portion 1 opposite theiixed leg andconstitutes an elekment-ofthemovable leg of the frame which is designated 'generally at 8. Thismovable leg includes the slide 7, a solid bar 9 pivoted to the slide, asat 7 and constitutingl the fixed member of the leg, and a tubularmember'lO'slidably fitted on the bar 9. The tubular member 10 is made ofresilient metal and has a slot 11 and a pair of clamping ears 12 havingthreaded apertures and cooperable with a clamping screw or bolt and nut-3 whereby the hollow member may be releasably secured in adjustedposition on the lined member 9. The inner end of the bar 9 is beveled toprovide a bit or knife edge 9 adapted to have biting'engagement with thebody portion 1 to hold the slide in longitudinal adjustment thereon. Theouter end of the tubular member 10 is lformed and adapted tohavezmounted thereon an adjustable saw holder 14 cooper-able with theholder 6 to hold vthe saw blade on the frame. The holder 14 may be ofconventional construction or it may have an integral tubular portion 15designed to receive an end of a broken saw blade. In the tubular portiona transverse slot- 16 is provided and intersects the opening of thetubular portion so that a wedge 17 inserted in the slot 16 will have itssharp edge disposed to engage the teeth of the broken saw blade.

In practice, with this form of the invention, when the saw bladeisassembled and tightened up in the holders 6 and 14, the knife edge 9ais forced into biting engagement with the body portion 1 and the partsare locked in position and the desired rigidity of the frame is had.Prior to tightening up the saw in the holders 6 and 14, the desiredlongitudinal adjustment of the slide LID 7 along the body portion l maybe effec-ted. The legs 2 and 8 are readily extensible to adapt the trametor use on large as well as .small Werl; and in all adjustments acompact and effective trame is provided.

A handle 19 may be conveniently secured to the slide 7 to atiord a meansfor manipulating the saw.

lt is to be noted that as shown in the drawings the legs of the saw-trame diverge slightly from each other and as a conseguenee ot thisarrangement when the saw lnade is tensioned and secured in position, theextensible legs are held in their adjustment for the reason that theselegs cannot lengthen or shorten Without lengtheningor shortening the sawblade which, ot course, may not be done.

ln the form ot the inifentionshoivn in -lfigures 6 to 8, inclusive, thetrame comprises a. body portion or bridge bar 2O consisting ot a solidbar ot metal having at one end an angular extension 2l constituting thelined member of a lined leg designated generally at A. movable tubularmember 23 is slidably fitted on the fixed member 2l and carries at itsouter end a saw holder of conventional construction. The tubular members3 is provided with a lengthwise slet on the oppositel sides of whichare apertnred ears 24 with which a clamping screw or bolt and nut 25 iscooperable to hold the movable member 23 in adjusted position on thefixed member 2l, this construction being similar to that employed on themovable leg tl in Figures l to 5 inclusive. A movable leg 2G is providedand is exactly the same as that shown in Figures l to 5, inclusive, eX-cept as to the holder which is designated at 27 and which is ofconventional construction. In other respects the description above etthe. movable leg 8l is applicable thereto. The portion of the bodyportion 2O with which the pivoted member 9 is eooperable is toothed orserrated, as at 28.

l claim:

l. A hack saw :trame including a body portion and a pair of diverginglegs carried by the body portion, each leg oit the pair comprising apair o1 leg members constrained to axial adjustment relative to eachother whereby the legs are extensible, one pair et the legs beingadjustable along the body portion, the legs having means for holding andtensioning the saw blade. one of the leg members oit one of the legsbeing engageable with the body portion under the influence ot said meansWhen the same is tightened up to secure al san7 blade in position.

.ln a hack saw trame, an elongated bar comprising a body portion andhaving one end extended at an angle to said body portion to provide amember of' a leg, a tubular member adjustably iitted on the extendedportion oi said bar and providing` the other member ot the leg, the saidtubular member 1being closed on three sides and having an open sid/e,said tubular member having a pair or ears extending beyond the openside, and a clamping element connecting said ears, a slide adjustablealong the portion ot' the bar which provides the body portion, a barpivoted to the slide and engageable with the body portion, a tubularmember slidably fitted on said pivoted bar, the tubular member beingclosed on three sides and open on one side, said tubular member having apair ot ears extended beyond said open side, a clamping elementconnected With said ears vand said tubular members being provided withsaw holding and tensioning` means, the pivoted bar being urged intobinding engagement with the body portion when the said means is adjustedto secure and tension a sawy blade, the tubular members and the bars onwhich they are slidably fitted di` verging slightly from each other sothat the tubular members also diverge slightly lfrom each other wherebywhen the said means is adjusted to tighten and tension the saw blade thetubular members Will be secured in position on the bars on Which theyare carried.

FRANIIS ALEXANDER STIERHEM.

